Carb Heat = you will only need this above 5,500. at that level your engines will start to cut out. Apply a few clicks of Carb Heat until the rattle stops
Mixture = not sure this is really accurate or working. On full size I use mixture at around 5,000 to 6,000. At that altitude the air starts getting thin so your dont need as much fuel in your carb so you "Lean" out the mixture.
Prop Pitch = Blenheim had a two stage prop: Course & Fine. When its course its taking a huge bit out of the air so the RPM go way down (1,740)however the speed should stay the same.
all very good questions
Knuckles
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